cotangentn.adj.

/kəʊˈtandʒənt/

Etymology: < co- prefix 6 + tangent adj. and n. The Latin cotangens is used by Gunther Canon Triangulorum, 1620.

Trigonometry.

A. n. The tangent of the complement of a given angle.

(Abbreviated cot.)

ΘΚΠ

the world > relative properties > number > geometry > [noun] > branches of > trigonometry > functions of

right sine1581

sine1593

secant1594

tangent1594

secans1599

cosine1635

cotangent1635

cosecant1706

sec.-

1635 J. Wells Sciographia 47 So is the tangent of R. Z. P. To the cotangent of R. P. Z.

1706 Phillips's New World of Words (new ed.) Co-tangent is the Tangent of an Arch of a Circle, which is the Complement of another to 90 Degrees.

1708 J. Harris Lexicon Technicum (ed. 2) I Co-tangent, is the Tangent of an Arch, which is the Complement of another to 90 Degrees.

1831 D. Brewster Treat. Optics xix. 170 The index of refraction is the cotangent of the angle of polarisation.

1852 A. De Morgan Let. 16–17 July in R. P. Graves Life Sir W. R. Hamilton (1889) III. 387 Put cosines in the middle, sines on the flanks, and cotans on the extreme flanks.

B. adj.

cotangent line n. = cotangent.

ΚΠ

1652 T. Stirrup Horometria iv. i. 115 The side DE..(for distinction) may be called a Tangent line, and the side EF a Co-tangent line.

This entry has not yet been fully updated (first published 1893; most recently modified version published online March 2019).

单词	cotangent
释义	cotangentn.adj. /kəʊˈtandʒənt/ Etymology: < co- prefix 6 + tangent adj. and n. The Latin cotangens is used by Gunther Canon Triangulorum, 1620. Trigonometry. A. n. The tangent of the complement of a given angle. (Abbreviated cot.) ΘΚΠ the world > relative properties > number > geometry > [noun] > branches of > trigonometry > functions of right sine1581 sine1593 secant1594 tangent1594 secans1599 cosine1635 cotangent1635 cosecant1706 sec.- 1635 J. Wells Sciographia 47 So is the tangent of R. Z. P. To the cotangent of R. P. Z. 1706 Phillips's New World of Words (new ed.) Co-tangent is the Tangent of an Arch of a Circle, which is the Complement of another to 90 Degrees. 1708 J. Harris Lexicon Technicum (ed. 2) I Co-tangent, is the Tangent of an Arch, which is the Complement of another to 90 Degrees. 1831 D. Brewster Treat. Optics xix. 170 The index of refraction is the cotangent of the angle of polarisation. 1852 A. De Morgan Let. 16–17 July in R. P. Graves Life Sir W. R. Hamilton (1889) III. 387 Put cosines in the middle, sines on the flanks, and cotans on the extreme flanks. B. adj. cotangent line n. = cotangent. ΚΠ 1652 T. Stirrup Horometria iv. i. 115 The side DE..(for distinction) may be called a Tangent line, and the side EF a Co-tangent line. This entry has not yet been fully updated (first published 1893; most recently modified version published online March 2019). < n.adj.1635
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